fix: make get_pk_constraint adhere to SqlAlchemy specs #9
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Currently
get_pk_constraint()
returns a dict that isn't in line with the SqlAlchemy specification. As stated in the documentation,constrained_columns
: a list of column names that make up the primary keyname
: optional name of the primary key constraint.I.e. the columns should be a list, and the name should be the name of the primary key if it exists.
This PR casts the list of columns into a list, and assigns the name based on the first non NULL value returned for the constraint name if defined.